Magneto for multicylinder engines



W. E. SCHWARZMANN.-

MAGNETO FOB MULTICYLINDER ENGINES.

APPLICATION rzLED MAR.21.1919.

1,402,897, Patented Jan. 10, 1922.

UNITED STATES PATENT oFFlcE.

WOLFGANG E. SCHWARZMANN, 0F SPRINGFIELD, MASSACHUSETTS, ASSIGNOR TO .AMERICAN BOSCH MAGNETO COMPANY, OF SPRDTGFIELD, MASSACHUSETTS, A.

CORPORATION OlliV NEW YORK.

MAGNETOJOR vMIULTICYLINDER ENGINES.

specification of Letters Patent. Patented Jan, 10,1922,

Application iiled March 27, 1919. Serial No. 285,449.

Multicylinder Engines; and I do hereby de-- clare the following to` be a full, clear, and` exact description of theinvention, such as will enable others skilled in the art to which it appertains 'to make and use the same.

The present invention `relates to magnetos for igniting the combustible mixturelin multicylinder internal combustion engines, and particularly to magnetos of compact, self-contained and inexpensive though strong, eiicient and accessible construction.

Heretofore, in magnetos having the shafts of the distributor and magneto inclined to each other, it was usual to mount the distributor of the magneto upon some detachable -support or mounting at a comparatively remote location from the shaft of the generating rotor located within the magneto housing and to connect the distributor shaft with the rotor 'shaft by gears with a detachable gear housing having a bearing for supporting the portion of the rotor shaft carrying the driving gear, Inasmueh as the parts were remote and detachable, considerable machining and accurate fitting was necessitated, and the parts had to be comparatively large and expensive, aside from the general` structure being cumbersome and intricate,

' in order to provide a sullicietly strong magneto. In such magnetos, also, the permanent magnets vare located with the arms thereof disposed at right angles to the axis of the magneto rotor, further making the ma eto structure large and cumbersome.

n. accordance with one part of the invention, the magneto housing has a bearing for a rotor and integral wall portionsforming a gear cavityadjacent the bearing so that the top wallortion of the cavlty forms a base for theistributor and distributor block, as well as having a bearing therein for rotatably su porting the distributor shaft inclined to t e axis of the rotor, the shaft carrying a distributor element in cooperation with the block and having gearing 4for driving the same from the rotor.

On account ofzthe comparatively small -size of the worm gearing,

the distributor may be relatively small and mexpensive due to the small amount of high tension insulation required in the block and` to the shortness of the high tension wire connecting the collector and distributor brushes.

Although the magnet of the magneto may extend perpendicularly of the axis of rotation of the rotor, `I prefer to arrange the magnet with its arms lengthwise of the rotor, so that the distributor may be located at the top or on one side face of the magneto and therefore entirely accessible. The magnet may be of ,the usual horse-shoe type, although -I prefer to provide a separable and its location, y

magnet with a flatA cross-bar detachably fastened to flat'armsand providing a bearing for that end of the rotor and supporting the mechanical interrupter in an accessible posit1on`.

Whether or not the magnet is arched, the non-magnetic housing for the magneto referably has a iange extending aroun the worm gearing to provide a seat for a removable plate .closing the gearing to the outside, and -also providing a channel extending from the bearing of the distributor shaft to a terminal portion receiving a grease cup.

In the accompanying drawings illustratingthis preferred form of construction in application, as an example, to a high tension wound armature Itype of bipolar magneto having a separable magnet -with its arms extending lengthwise of the armature, and a distributor intended for a fou cylinder en ine and located on the top of therinagneto.

ig. 1 is a longitudinal section of the .l magneto on line 1 1 of Fig. 2; Fig. 2 is a section dn line 2 2 of Fig. 3; Fig. 3 is a section on line 3 3 of Fig. 4; and Fig. 4

'isa-view, partly broken away, from the top the other yone is grounded on the frame of the magneto. The cam ring 9 carries the interrupter cams 10 and the timing arm 11,

and the cover 12, held in place by the spring 13, carries the grounding brush 14 and the binding post 15.

rlhe collector 16 is'fastened on the driving shaft 17 inside the bearing 3 so as to be easily connected to the high tension terminal of the secondary Winding. The brush holder 18 has a brush 19 cooperative With the collector. Outside the bearing 3, that is overhanging it, is a Worm 20 fast on the driving shaft 17 and in mesh With a Worm Wheel 21 forming Worm gearing ofone-half speed reduction between the armature and Athe vertical distributor shaft 22 on Which thepworm Wheel is fastened. rlhe rotatable element 23 is carried on the shaft 22 in cooperation with the four spark plug distributor segments 24 mounted in the distributor block 25 on the top of the magneto at the driving end thereof. From thesegments,

the conductors 26 lead to the respective spark plugs in the engine cylinders in` the Well known Way.

An aluminumhousing has cast in it the pole shoes 27 to which the magnet arms 25 are attached. Besides forming a closure for the armature between the arms of the magnet, it carries the bearing 3 and forms a closure for the collector 16. Also it carries the bearing 28 for the distributor shaft 22 and provides a channel 29 into the terminal portion of Which fits a grease cup 30. At

the top of this housing, opposite the base 31 thereof, is an integral distributor seat 32 for the distributor block 25. Furthermore, the housing has a cav-ity at 33 for the Worm gearlng with a seat fora detachable plate 34 which tsover the driving shaft 17 and closes the gearing to the outside in a manner permitting ready inspection and replacement thereof.

The outside conductor 35 connects the collector brush 19 with the binding post 36 Which is connected through a central brush 37 to the rotatable element 23 of the distributor.

As a result of the fact that the aluminum housing carries the pole shoes 27 and the bearings 3 and'28, and forms closures for the armaturecollector and Worm gearing, besides a `basefor the distributor, the machining and'itting required is considerv'ably reduced, which, together With 'the fact that tWo bearings suffice for the armature,

and a short outside conductor connects the A:f'colleetor and distributor brushes, renders 6'5l i Maase? light but strong, and self-contained but small, and inexpensive but eiicient, as has been shown by manufacture and test.

Having thus described my invention, what I claim is:

1. In a magneto for multicylinder engines, a rotor, a rotor housing having a bearing and integral Wall portions forming a gear cavity adjacent said bearing, saidA cavityy having a top Wall forming a distributor base, a distributor block seated on said base, a distributor element rotatable in cooperation With said block and having a. shaft journaled in said bearing on an axis inclined to the axis of the rotor, and gearing for driving the distributor shaft from the rotor.

2. In a magneto for multicylinder engines, a rotor, a rotor housing having a bearing and integral Wall portions forming a gear cavity adjacent said bearing, said cavity having a top Wall portion forming a distributor base with a lubricating channel extending thereto, a distributor mounted on said top Wall portion and having a shaft journaled therein on an axis inclined to the axis Y of the rotor, gearing for driving the distributor shaft from the rotor, and a grease cup fitted in said channel.

3. ln `a magneto for multicylinder engines, the combination of a housingbeing open at both ends and having an integral transverse Wall intermediate the ends thereof, thereby forming an armature chamber on one side of said wall and a gear cavity on the'other side of said Wall, a bearing in said wall, a permanent magnet composed of two side arms and a cross-bar detachably fastened therebetween, said cross-bar closing one end of said housing and chamber, a bearing in said crossbar, a rotor having a shaft rotatably mounted in said bearings, said shaft having a free end extending into said gear cavity, said cavity having a top Wall forming an integral portion of said housing, a distributor' on said top Wall having a shaft rotatably mounted in said top Wall, said distributor shaft being operatively connected to said shaft Within said cavity. i

4. ln a magneto for multicylinder engines, the combination of a housing having an integral transverse Wall separating'said housing into an armature chamber and a gear cavity, a bearing in said transverse Wall, means for closing the open end of said chamber, a bearing in said closing means, a rotor having a shaft extending through said chamber and rotatably supported in said bearings, said shaft having a free end extending from said bearing in said Wall into said gear cavity, a gear fixed to said shaft end in -said cavity, said cavity having atop Wall forming an integral portion of said housing, a bearing finsaidtop wall, a disl y i tributor shaft in said last mentioned bearing thef magneto compact but accessible, 'l and and inclined to said rotor shaft, a distributor 130 5. In a magneto for multicylinder engines,

. a rotor, a rotor shaft, two bearings therefor,

a distributor arranged at the driving end of the magneto, worm gearing overhanging the bearing at the driving end for driving the distributor from the rotor, a rotor housing having an open sided cavity for the worm gearing, said cavity having a top Wall portion forming a' distributor base and a removable plate tted over the end of the rotor shaft and closing said cavity to the outside.

6. In a magneto for multicylinder engines,

' a rotatable armature, a generating winding mounted thereon, a collector electrically connected to oney terminal of the generating winding, a housing covering the armature and collector and having a bearing, a distributor mounted on said housing at the collector end of the magneto and having a shaft journaled in said bearing on an axis inclined to the axis of the armature, gearing for driving the distributor shaft from the armature, a brush holder having a brush cooperating with the collector, and an outside conductor extending from the brush holder in A electrical connection with the brush thereof to the distributor in cooperation with the rotatable element thereof.

7'. In a magneto for multicylinder engines, a rotatable armature, a generatingwinding mounted thereon, a magnet having its arms extending lengthwise of the armature and I having a flat cross-bar containing a bearing for the armature, a mechanical .interrupter electrically connected to the generating winding and supported on the outside of the cross-bar, a collector electrically connected to the generating winding and mounted on the armature to the driving end of the magneto opposite the mechanical interrupter, a housing forming a closure for the armature and collector, a distributor mounted on the housing at the driving end, and worm gearing mounted in a cavity of the housing and overhanging the bearing at the driving end for driving the distributor from the'armature, said housing having a bearing for the driving end of the armature and another bearing for the worm gearing.

In testimony whereof I affix my signature.

WOLFGANG E. scHwARzMANN. 

